Telescoping core-drill



Fb. 7, 1933. 1 SOLL 1,896,469

TELESCOPING CORE DRILL Filed April 11, 1951 1R7'Hu7? paw. Mega INVENTOR1,

Meme Feb. 7, test i atw ARTHUR SOLL, OF GQMPTON, CALIFORNIA, ASSIGNOR OF THIRTY-SEVEN AND ONE-HALF PER ICENT TO LEWIS A. LARSON AND TWENTY-FIVE BEVEB, BOTH or Boater, mane PER CENT T0 SAMPSON C.

TEL'ESCOPING CORE-DRILL Appliation filed April 11,

' the tool in such a condition even thou h the material be of a character that would e ow a a tendency to collapse if not so held.

Another object is to provide means Where= by a clogging up ofthe tool can be avoided even though the taken material has the-tend to collapse.

enc (d ther objects will appear from the following description and appended claims'as well as from the accompanying -draw1ng, 1n which-1 I K 0 Fig. 1 is a fragmentary longitudinal midsectionalview of a core-drill provided with aretainer designed to operate according to this invention. Y

Fig. 2 is an enlarged fragmentary detail section of a frictional interengagement be tween adj oining tube members. So-called core-takin is practiced for vari- ,ous reasons, in 'well-dri ling, earthboring, by the oil industry as well as by others, principally, however, to disclose the strata of different formations in the ground, in the natural, or chronological, or continuous and undisturbed order in which such formations are contained or embedded in the earth.

However, though certain layers of certain formations form a rigid or firm mass from which a suitable portion may work itself in form of a core into a drilling tool, other formations are not in such firm layers, or at least have a tendency to break up into smaller pieces that may clog up the inside of the drilling tool instead of slipping further and further into the drilling tool as the tool is forced into the ound.

on the other and, inasmuch as a core be 1931. Serial No. 529,324.

comes more desirable the deeper the strata is disposed from which samples could give information, and, since a drilling may extend several thousand feet below the surface, it stands to reason that it cannot always'be positively'ascertained whether the inside of the tool is becoming clogged up, notwithstanding the fact that some drillers claim to be able to feel any functioning of the tool in the ground by a touch of the working rod extending above the ground,'before serious trouble is encountered, or at least the core-materialin the tool is milled about to such an extent that its value as a core for the. purpose for which 1t is wanted is rather doubtful.

As illustrated, a series of comparatively thin and light tube-members 3 are telescopically mounted within' the drilling tool 4 i which may be of. the customary strong. and

heavy deslgn, with a cutter head 5 at its low ermost termination and a suitably shaped top end 6 adapted to be attached to the working T rods or tubes of a well-drilling outfit.

The outermost tube member 3 issuitably engaged to the tool 4, while the innermost tube member 3 is provided with a central head 7 against which any material cored nto the drilling tool jwillabut if solid and thereby free enough to slip into the. tubes.

core that would serve to push against the head 7, or a crumbling massof material that would most likely bind against the inner walls of the tubes, any material upon being cored or forced into the several tubes would rial.

Moreover, most important of all, any material picked up by or into the drilling tool' strata.

If the coredmaterial is of the crumbling type it most likely will lift each successive tube section as ,soon as the entering mate- However, whether a solid and coherent rial is frictionally sufficiently engaged to the inside walls of any of the tube sections independently of any frictional engagement of the material in any of the other tube sections.

On the other hand, if the material is firm and sulficiently coherent, the topmost or furthermost advanced end of a solid core will abut against the head 7 and thereby lift the several telescoping tube sections one after the other by means of the shouldered engagement 89 at the ends of the sections.

When a crumbling strata is encountered, it would perhaps not be advisable to use any rinsing liquid, since bythe enormous pressure customarily applied, especially at great depth, a large portion of the cored material would be washed or forced to the surface and still in the hole, to prevent a back-washing of the core from the core-barrel into the hole, the head 7 is provided with a check-valve 12, whereby the liquid in the bore-hole or well is prevented from entering the core-tool from the top end asthe tool is removed from the well.

For guiding the top end of the several tubesections centrally within the tool 4, barrelguides 13 are provided.

Core catching members 14 are provided in the lower end of the coring tool, and also core-guiding members or a core guide 15.

Though it normally is not absolutely essential that the severaltelescoping tube sections be provided with any further engagements besides those referred to above and indicated at 89, for and during certain welldrilling operations it may be desirable to have the additional lightly frictionally engaging indentations 16 nrovided near the shouldered ends of the tube sections.

Such indentations would require a slight or light jerking force for disengaging one tube section from the other.

It must be understood that the core-barrel or tube sections 3 are of comparatively thmmaterial while the tool 4: may be considerable heavier, since the barrel is not really subjected to any great strain but merely serves to follow the core advancing gradually into the tool. Having thus described my invention, I claim:

1. In a core-drill for well drilling operations having a cutter-head at the bottom end and a connection at the upper end by which hollow of the said body and adapted to guide and hold a core as it advances into the drillbody.

3. In a core-drill, a hollow drill-body, a telescopically sectio'ned,core-barrel normally disposed in the lower end of the hollow of the drill-body and adapted to telescopically follow any material entering the drill-body with the innermost section of said barrel-to come into contact with the entering core first and the succeeding sections 4.-In a core-drill, a hollow drill-body, a

telescopically sectioned core-barrel in the drill-body, and a head-member on the innermost section of said barrel adapted to be the first part to contact with any core-material entering the barrel.

5. In a core-drill, a hollow drill-body, a telescopically sectioned core-barrel in the drill-body, a head-member on the innermost section of said barrel and a check-valve in said head adapted to prevent a back-washing of received core-material.

6. In a core-drill, a hollow drill-body, a

.tclescopically sectioned core-barrel in the drill body, and a core-catching member in the lower end of the drill-body.

7. In acore-drill, a hollow drill-body, a telescopically sectionedcore-barrel in the drill-body, core-catching means in the lower end of the drill-body, and guiding means in the body for guiding core-material into the telescopically disposed core-barrel in the drill-body.

In testimony that I claim the foregoing as my invention I have signed my name.

ARTHUR SOLL. 

